package com.heima.article.service.impl;

import com.alibaba.fastjson.JSON;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.heima.article.mapper.ApArticleConfigMapper;
import com.heima.article.mapper.ApArticleContentMapper;
import com.heima.article.mapper.ApArticleMapper;
import com.heima.article.service.ApArticleService;
import com.heima.article.service.ArticleFreemarkerService;
import com.heima.common.constants.ArticleConstants;
import com.heima.common.redis.CacheService;
import com.heima.model.article.pojos.ApArticle;
import com.heima.model.article.pojos.ApArticleConfig;
import com.heima.model.article.pojos.ApArticleContent;
import com.heima.model.article.vos.HotArticleVo;
import com.heima.model.common.dtos.ArticleDto;
import com.heima.model.common.dtos.ArticleHomeDto;
import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.common.enums.AppHttpCodeEnum;
import com.heima.model.mess.ArticleVisitStreamMess;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.Comparator;
import java.util.Date;
import java.util.List;
import java.util.stream.Collectors;

@Service
@Transactional
@Slf4j
public class ApArticleServiceImpl extends ServiceImpl<ApArticleMapper, ApArticle> implements ApArticleService {

    @Autowired
    private ApArticleMapper apArticleMapper;

    @Autowired
    private ApArticleConfigMapper apArticleConfigMapper;

    @Autowired
    private ApArticleContentMapper apArticleContentMapper;

    @Autowired
    private ArticleFreemarkerService articleFreemarkerService;


    private final static short MAX_PAGE_SIZE = 50;
    /**
     * 加载文章列表
     * @param dto
     * @param type 1 加载更多 2 加载最新
     * @return
     */
    @Override
    public ResponseResult load(ArticleHomeDto dto, Short type) {
        //1.校验参数
        //分页条数的校验
        Integer size = dto.getSize();
        if(size == null || size == 0){
            dto.setSize(10);
        }
        //分页的值不超过50
        dto.setSize(Math.min(size,MAX_PAGE_SIZE));

        //校验type参数
        if(!type.equals(ArticleConstants.LOADTYPE_LOAD_MORE) && !type.equals(ArticleConstants.LOADTYPE_LOAD_NEW)){
            type = ArticleConstants.LOADTYPE_LOAD_MORE;
        }

        //频道参数校验
        if(StringUtils.isBlank(dto.getTag())){
            dto.setTag(ArticleConstants.DEFAULT_TAG);
        }

        //时间校验
        if(dto.getMaxBehotTime() == null){
            dto.setMaxBehotTime(new Date());
        }
        if(dto.getMinBehotTime() == null){
            dto.setMinBehotTime(new Date());
        }


        List<ApArticle> articleList = apArticleMapper.loadArticleList(dto,type);
        return ResponseResult.okResult(articleList);
    }

    /**
     * 保存修改文章
     * @param dto
     * @return
     */
    @Override
    public ResponseResult saveArticle(ArticleDto dto) {
        //try {
        //    Thread.sleep(3000);
        //} catch (InterruptedException e) {
        //    e.printStackTrace();
        //}
        //1.检查参数
        if(dto == null){
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }
        ApArticle apArticle = new ApArticle();
        BeanUtils.copyProperties(dto,apArticle);
        //2.判断是否存在id
        if(apArticle.getId() == null){
            //2.1 不存在id 保存 文章 文章配置 文章内容
            //2.1.1.保存文章
            save(apArticle);
            //2.1.2.保存文章配置
            ApArticleConfig apArticleConfig = new ApArticleConfig(apArticle.getId());
            apArticleConfigMapper.insert(apArticleConfig);
            //2.2.3.保存文章内容
            ApArticleContent apArticleContent = new ApArticleContent();
            apArticleContent.setArticleId(apArticle.getId());
            if(dto.getContent() == null){
                return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
            }
            apArticleContent.setContent(dto.getContent());
            apArticleContentMapper.insert(apArticleContent);
        }else{
            //2.2 存在id 修改文章 文章内容
            //1.修改文章
            updateById(apArticle);
            //2.修改文章内容
            ApArticleContent apArticleContent = apArticleContentMapper.selectOne(Wrappers.<ApArticleContent>lambdaQuery().eq(ApArticleContent::getArticleId,apArticle.getId()));
            if(apArticleContent == null){
                return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID,"文章没有找到");
            }
            apArticleContent.setContent(dto.getContent());
            apArticleContentMapper.updateById(apArticleContent);
        }

        //异步调用 生成静态文件上传minio中
        articleFreemarkerService.buildArticleToMinIO(apArticle, dto.getContent());

        return ResponseResult.okResult(apArticle.getId());
    }

    @Autowired
    private CacheService cacheService;

    @Override
    public ResponseResult load2(Short loadType, ArticleHomeDto dto, boolean firstPage) {
        if(firstPage){
            String jsonStr = cacheService.get(ArticleConstants.HOT_ARTICLE_FIRST_PAGE + dto.getTag());
            if(StringUtils.isNotBlank(jsonStr)){
                List<HotArticleVo> hotArticleVoList = JSON.parseArray(jsonStr, HotArticleVo.class);
                ResponseResult responseResult = ResponseResult.okResult(hotArticleVoList);
                return responseResult;
            }
        }
        return load(dto,loadType);
    }

    /**
     * 更新文章的分值，同时更新缓存中的热点文章数据
     * @param mess
     */
    @Override
    public void updateScore(ArticleVisitStreamMess mess) {
        //1.更新文章阅读量，点赞量，收藏量，评论量
        ApArticle apArticle = updateArticle(mess);
        //2.计算文章分值
        Integer score = computeScore(apArticle);
        score = score * 3;
        //3.更新对应频道的缓存数据
        replaceDataToRedis(apArticle,score,ArticleConstants.HOT_ARTICLE_FIRST_PAGE + apArticle.getChannelId());
        //4.更新推荐对应的热点数据
        replaceDataToRedis(apArticle,score,ArticleConstants.HOT_ARTICLE_FIRST_PAGE+ArticleConstants.DEFAULT_TAG);
    }

    /**
     * 替换数据并存入redis
     * @param apArticle
     * @param score
     * @param key
     * @return
     */
    private void replaceDataToRedis(ApArticle apArticle, Integer score, String key) {
        String articleListStr = cacheService.get(key);
        if(StringUtils.isNotBlank(articleListStr)){
            List<HotArticleVo> hotArticleVoList = JSON.parseArray(articleListStr, HotArticleVo.class);

            boolean flag = true;
            //如果缓存中存在该文章，只更新分值
            for (HotArticleVo vo : hotArticleVoList) {
                if(vo.getId().equals(apArticle.getId())){
                    vo.setScore(score);
                    flag = false;
                    break;
                }
            }
            //如果缓存中不存在，查询缓存中分值最小的一条数据，进行分值的比较，如果当前文章的分值大于缓存中的数据，就替换
            if(flag){
                if(flag && hotArticleVoList.size() >= 30){
                    hotArticleVoList = hotArticleVoList.stream().sorted(Comparator.comparing(HotArticleVo::getScore).reversed()).collect(Collectors.toList());
                    HotArticleVo lastHot = hotArticleVoList.get(hotArticleVoList.size() - 1);
                    if(lastHot.getScore() < score){
                        hotArticleVoList.remove(lastHot);
                        HotArticleVo hot = new HotArticleVo();
                        BeanUtils.copyProperties(apArticle,hot);
                        hot.setScore(score);
                        hotArticleVoList.add(hot);
                    }

                }else{
                    HotArticleVo hot = new HotArticleVo();
                    BeanUtils.copyProperties(apArticle,hot);
                    hot.setScore(score);
                    hotArticleVoList.add(hot);
                }
            }
            hotArticleVoList = hotArticleVoList.stream().sorted(Comparator.comparing(HotArticleVo::getScore).reversed()).collect(Collectors.toList());
            cacheService.set(key,JSON.toJSONString(hotArticleVoList));
        }
    }

    /**
     * 计算文章分值
     * @param apArticle
     * @return
     */
    private Integer computeScore (ApArticle apArticle) {
        Integer score = 0;
        if(apArticle.getViews() != null){
            score += apArticle.getViews();
        }

        if(apArticle.getLikes() != null){
            score += apArticle.getLikes() * ArticleConstants.HOT_ARTICLE_LIKE_WEIGHT;
        }

        if(apArticle.getComment() != null){
            score += apArticle.getComment() * ArticleConstants.HOT_ARTICLE_COMMENT_WEIGHT;
        }

        if(apArticle.getCollection() != null){
            score += apArticle.getCollection() * ArticleConstants.HOT_ARTICLE_COLLECTION_WEIGHT;
        }
        return score;
    }

    /**
     * 更新文章行为数量
     * @param mess
     * @return
     */
    private ApArticle updateArticle(ArticleVisitStreamMess mess) {
        ApArticle apArticle = getById(mess.getArticleId());
        apArticle.setLikes(apArticle.getLikes() == null ? 0 : apArticle.getLikes() + mess.getLike());
        apArticle.setCollection(apArticle.getCollection() == null ? 0 : apArticle.getCollection() + mess.getCollect());
        apArticle.setComment(apArticle.getComment() == null ? 0 : apArticle.getComment() + mess.getComment());
        apArticle.setViews(apArticle.getViews() == null ? 0 : apArticle.getViews() + mess.getView());
        updateById(apArticle);
        return apArticle;
    }


}
